Study on 3D Flow Field Characteristics of Control Valve Based on 2D-PIV

doi:10.12141/j.issn.1000-565X.230152

Abstract

Abstract:

The flow state in the flow channel of the control valve directly affects its service life and system stability. In order to explore the three-dimensional flow field information inside the control valve, a series of three-dimensional grid nodes were obtained by shooting different planes with a two-dimensional particle image velocimetry (2D-PIV) device, and the flow field information of unknown nodes was obtained by interpolation, so as to realize the three-dimensional reconstruction of the control valve flow field. The experimental results show that the overall trend of the three-dimensional reconstructed velocity field is consistent with that of the two-dimensional velocity field. The oil at the throttle port of the control valve forms a counter jet due to the throttling effect, and the jet converges to form a high-speed overall jet in the downstream of the valve core head. The combination of impinging jets on both sides in the top area of the valve core will produce a certain amount of oil backflow. The overall flow channel velocity decreases gradually with the moving out of the shooting plane. The velocity distribution of the upstream flow channel decreases steadily at first and then maintains a stable value. The velocity value near the throttle orifice increases first and then decreases, with a large variation. The wall resistance and shear force keep the near-wall velocity stable. The flow velocity in the downstream region is concentric and the flow field changes from turbulent flow to orderly flow. The simulation results show that the overall area of the three-dimensional reconstruction flow field is primarily consistent with the theoretical flow field. The maximum reconstruction error is 9.5%, occurring in the high-speed flow area of the throttle. The experimental reconstruction results is highly similar to the simulation reconstruction results and the reconstruction effect in the smooth flow area is better than that in the violent part. The research can provide a reference for the structural optimization design of the control valve and the improvement of cavitation performance, and is also provides an effective reference for the three-dimensional flow field measurement of the micro-channel.

Key words: flow visualization, particle image velocity, control valve, velocity field, 3D reconstruction

CLC Number:

TH137

LIU Xiumei, WU Su, LI Beibei, et al.. Study on 3D Flow Field Characteristics of Control Valve Based on 2D-PIV[J]. Journal of South China University of Technology(Natural Science Edition), 2023, 51(11): 110-118.

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名称	型号	性能参数
齿轮泵	CBN-F310	20 MPa额定压力
溢流阀	YF-L10H-4	16 MPa额定压力
流量计	YH-LWC10SLA	1.0%级/10 MPa
压力表	YB-150	0.4精度等级

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